Improvement in the manufacture of bolts



Nrrn STATES ATENT Brice..

IMPROVEMENT IN THE MANUFACTURE OF BOLTS.

SI eciication forming part of Letters Patent No. 47,! H3, dated April 4,1805.

To @ZZ whom, it may concern:

Be it known that 1, WiLLrAM J. Lnwrs, of the city of Pittsburg', in the county of Allegheny and State of Pennsylvania, have inented a new and Improved Method ot' Making' Bolts with Square Necks, and I hereby declare that the following' is a full, clear, aml exact description of n' y invention, reference being had to the accompanying drawings, forming part ot this specification, and to the letters ot' reference marked thereon.

The nature of my invention consists in making' square-necked bolts from round iron rods, one side ot' which square will equal the diameter ofthe round rod from which they are forged, and this I accomplish by first stavingnp i or enlarging that part ol' t he rod intended for the neck and head to -such au extent that when subsequently placed be.- tween the gripping and headingdies that portion required t'or the neck will be compressed into a perfectlysharp-cornered square, aml at the same time that the head is being m-ade.

To enab'e others to understand my improved method,I will proceed to describe the ooeration by reference to the accompanying' drawings.

Io make square-necked bolts in accordance with my plan, I tirst take a round rod of iron ot the diameter required for the body'D, Fig. l of the bolt. This, when properly heated, is inserted in the cavity B between the steel gripping-dies T It, Fig'. 2, which are constructed and operated in a similar manner to those of other bolt-heading machines. The upper portion otl the cavity S, however, being' somewhat larger than the rod, this enlargement reaching half the depth otl the dies, the rod on its insertion is gripped and held by the narrowest part, B, ofthe cavity until the advance of the heading punch L staves up that part of the rod in the large part of the cavity S until it assumes the shape and increased thickness N represented at Fig. l, when, ou

being released by the opening ofthe dies, Fig'. 2, it is taken by the operator, reheated, and submitted to the action ot' the compressing' and squaring dies, Fig. 4. These dies are similar in construction to those just described; but instead ot' the cavity x iu these dies being cylindrical all the nay' through the upper part, l), is made square, which, as the dies close on the enlarged end of the rod, give shape by compression to the neck C, Fig. 6, of the bolt, forming a perfectly full and sharp-cornered square, unattainable by any other means where the bolt is made from round iron the size required for the body under the neck. As soon as the dies, Figa/4, close on the iron, the advancement of the cupshaped header, Fig. 5, takes place and forms the head by further staving up of that portion ot' the enlarged rod projecting beyond the dies toward the header, this operation being' similar in all respects to that ot' other bOItheading' machines already in use.

I would here remark that l am aware that bolts with square necks have been iliade from round rods, but in that case the square was produced by staving' in a die having' asquare. recess. Therefore I wish it distinctly undel'- stood that Llay no claim to making bolts With square necks from round iron. Neither do I claim the formation or construction of dies or the operation of any kind otn machinery for the purpose of making' bolts; but

Making' bolts with square necks from round iron by tirst staving up or enlarging' that part ot' the rod intended for the neck previous to the formation of the square, and subsequently squaring that pait by compression or otherwise without regard to the nature ofthe tools used for that purpose.

\VM. J. LEWIS. Witnesses:

J osiAH W. ELLs, J oIiN MCKENNA. 

